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Real-Time Clock Power Interrupt – Data Erratic, Intermittent or Incorrect
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 319 PID: P251 SPN: 251 FMI: 2/2 LAMP: Amber (Maintenance Flashout) SRT: |
Real-Time Clock Power Interrupt – Data Erratic, Intermittent or Incorrect. Real-time clock lost power. |
None on performance. Data in the ECM will not have accurate time and date information. |
 Real-Time Clock Power Circuit
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Circuit Description
Under ordinary operating conditions, the real-time clock in the electronic control module (ECM) is powered by the vehicle’s batteries. If battery power to the ECM is lost, then the real-time clock will be powered by a battery in the engine harness (if equipped).
Component Location
The real-time clock battery is secured to the engine harness near the ECM. Refer to Procedure 100-002 (Engine Diagrams) in Section E for a detailed component location view.
Shop Talk
This fault indicates that the real-time clock in the ECM lost power. Possible causes for this fault are weak or failed real-time clock battery, failed wiring or connectors between the battery and ECM, or the engine is not equipped with a real-time clock battery and the vehicle battery power to the ECM is lost.
NOTE:If the Real Time Clock is supplied by the OEM via a CAN BUS and a battery backup is not used, then refer to the OEM wiring diagram. If this is the case, then check INSITE™ electronic service tool, “Advanced ECM Data – Real Time Clock Settings.” If the OEM supplies a Real Time Clock signal, then the address must be set according to the OEM wiring or the fault code will become active.
Refer to Troubleshooting Fault Code t05-319
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